13609557 has 24 divisors (see below), whose sum is σ = 21296184. Its totient is φ = 8325504.

The previous prime is 13609513. The next prime is 13609559. The reversal of 13609557 is 75590631.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3837681 + 9771876 = 1959^2 + 3126^2 .

It is not a de Polignac number, because 13609557 - 2¹⁰ = 13608533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13609559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34083 + ... + 34479.

It is an arithmetic number, because the mean of its divisors is an integer number (887341).

Almost surely, 2^13609557 is an apocalyptic number.

It is an amenable number.

13609557 is a deficient number, since it is larger than the sum of its proper divisors (7686627).

13609557 is a wasteful number, since it uses less digits than its factorization.

13609557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709 (or 706 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 36.

The square root of 13609557 is about 3689.1133080999. The cubic root of 13609557 is about 238.7525376410.

The spelling of 13609557 in words is "thirteen million, six hundred nine thousand, five hundred fifty-seven".